my friend, your sitting on a seesaw here. If your wanting more power then you must sacrifice efficiency and if your asking efficiency you must sacrificing power. for power you can do simple mods such as cold air intake, exhaust system, or go to extreme and swap a b16 dual vtec with stage 3 cams. Now for efficiency, leave the car stock and keep it maintained. lower the car, find some lightweight wheels and carbon fiber stuff like hoods trunks mirrors ect. just remember to keep it light, but if you want to sit on both sides of the seesaw then u can.